Updated FAQ (markdown)

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+++ b/FAQ.md
@@ -75,6 +75,17 @@ https://github.com/tmk/tmk_keyboard/blob/master/doc/keymap.md#31-momentary-switc
 http://geekhack.org/index.php?topic=57008.msg1492604#msg1492604\r
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+## Mechanical Lock Switch Support\r
+LOCKING_SUPPORT is for mechanical lock switch like this Alps one. http://deskthority.net/wiki/Alps_SKCL_Lock\r
+\r
+Using enabling LOCKING_SUPPORT and using LCAP keycode in keymap you can use physical locking Capslock key as you expected. For example, Apple Extended Keyboard(AEK) and AEK II have.\r
+\r
+Old vintage mechanical keyboard occasionally has lock switch but modern ones including your HHKB don't have. You don't need LOCKING_SUPPORT for HHKB and just use CAPS for Capslock.\r
+\r
+With default HHKB keymap you can register Capslock with FN0+Tab. This doesn't work for you?\r
+\r
+\r
+\r
 # Degug Console\r
 ## hid_listen can't recognize device\r
 When debug console of your device is not ready you will see like this:\r